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I looked last night. I believe that it is in fact located in the battery box. Thanks for the info!! Now, I need to find out how difficult it is to replace - is it a matter of just taking the old one out and installing the new one???

Replacing the ECM is very easy....two connectors and four small bolts.

BUT

Replacement ECMs do not come with the PROM or memory chip in them. Use either have to reuse your old one (hope its still good), or get a replacement one. GM does not have them, only place I found was HyperChip which I got through Summit Racing. Took eight weeks to get it to!!